[Qt-interest] QPainter::drawImage behaviour, a bug?

[nsf]

On Fri, 11 Jun 2010 05:08:37 -0700 (PDT)
Mihail Naydenov <mlists at ymail.com> wrote:

> Yes, Qt will pre-multiply your images, try using QImage::Format_ARGB32_Premultiplied instead.

Unfortunately, this is not an option, since I'm doing save/load cycle
anyway, so it gets converted back and forth and that process causes
mismatch (obviously).

Thanks anyway for a reply, I'll do it using custom memcpy-based
function.

P.S. Premultiplied alpha format is good for fast blending for sure, but
when this is just about copies (e.g. CompositionMode_Source) it harms..